Preparation of Carbon Foam-loaded One-dimensional TiO2 for Photothermal Catalytic Evaporators and Its Performances of Evaporation and Degradation for Wastewater

doi:10.7503/cjcu20240295

Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (10): 20240295.doi: 10.7503/cjcu20240295

• Physical Chemistry • Previous Articles Next Articles

Preparation of Carbon Foam-loaded One-dimensional TiO₂ for Photothermal Catalytic Evaporators and Its Performances of Evaporation and Degradation for Wastewater

ZHANG Yidong¹, YUAN Jiaxiang¹, FANG Wei¹(), LU Chenglong², CHEN Hui¹, HE Xuan¹, DU Xing¹, LI Weixin¹, WANG Daheng¹, ZHAO Lei¹

^1.State Key Laboratory of Refractories and Metallurgy，Wuhan University of Science & Technology，Wuhan 430081，China
^2.School of Materials Science and Engineering，Hubei Polytechnic University，Huangshi 435003，China

Received:2024-06-19 Online:2024-10-10 Published:2024-08-12
Contact: FANG Wei E-mail:fangwei@wust.edu.cn
Supported by:
the National Natural Science Foundation of China(22105151);the Key Research Program of Hubei Province, China(2022BAA094);the Natural Science Foundation of Hubei Province, China(2021CFB469);the Scientific Research Plan of Department of Education of Hubei Province, China(B2022017);the Open Fund for the State Key Laboratory of Refractories and Metallurgy, China(G202407)

Abstract

Abstract:

Interfacial photothermal water evaporation is a very promising research technique for organic wastewater purification， but there is also the problem of organic pollutant deposition on the surface of the photothermal evaporator. In this paper， composite photothermal catalytic material（CF@RT） was prepared by introducing nano-TiO₂ with photocatalytic effect into porous carbon foam photothermal absorber for simultaneous degradation of pollutants during photothermal wastewater evaporation. The structure and photothermal catalytic performance of this composite were analyzed. The results show that a large number of one-dimensional TiO₂ nanorods with a diameter of about 10 nm were grown in CF@RT， and the nanorods were homogeneously dispersed on the surface of the carbon foam and in the pore structures. The introduction of TiO₂ effectively broadens the range of the material's response to light， making the composite material dual-functional for photothermal and photocatalysis. Porous carbon foam evaporates water by absorbing visible-infrared light and converting it to heat， while one-dimensional TiO₂ absorbs UV-visible light to form electron-hole pairs and degrades pollutants through redox eactions. Meanwhile， the combination of carbon foam and TiO₂ also led to a synergistic promotional effect between photothermal and photocatalysis. The photocatalytic process inhibits pollutant deposition to promote the continuous enhancement of the evaporation performance of the photo-thermal conversion， and the photothermal effect accelerates the separation and migration of photogenerated electron-hole pairs to promote photocatalytic degradation. Under one solar irradiation， the MB degradation rate of the most effective CF@RT sample reached 74% in 2.5 h with a photothermal water evaporation rate of 0.89 kg·m^-2·h^-1. It is worth mentioning that the water evaporation of the composite evaporator has revealed a featured improvement up to 0.95 kg·m^-2·h^-1 after 4 cycles.

Key words: Carbon foam, One-dimensional TiO₂, Solar steam generation, Photothermal catalysis

CLC Number:

O643

TrendMD:

ZHANG Yidong, YUAN Jiaxiang, FANG Wei, LU Chenglong, CHEN Hui, HE Xuan, DU Xing, LI Weixin, WANG Daheng, ZHAO Lei. Preparation of Carbon Foam-loaded One-dimensional TiO₂ for Photothermal Catalytic Evaporators and Its Performances of Evaporation and Degradation for Wastewater[J]. Chem. J. Chinese Universities, 2024, 45(10): 20240295.

Figures/Tables 14

References 26

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Sample	Temperature/℃	Decay time/ns		Relative amplitude（%）		Average lifetime/ns
Sample	Temperature/℃	τ₁	τ₂	A₁	A₂	Average lifetime/ns
CF@RT160	25	0.93	4.21	48.93	51.07	3.64
CF@RT160	50	1.02	5.81	46.79	53.21	5.17
CF@RT160	100	1.20	8.99	55.20	44.80	7.89

Sample	Temperature/℃	Decay time/ns		Relative amplitude（%）		Average lifetime/ns
Sample	Temperature/℃	τ₁	τ₂	A₁	A₂	Average lifetime/ns
CF@RT160	25	0.93	4.21	48.93	51.07	3.64
CF@RT160	50	1.02	5.81	46.79	53.21	5.17
CF@RT160	100	1.20	8.99	55.20	44.80	7.89

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Preparation of Carbon Foam-loaded One-dimensional TiO₂ for Photothermal Catalytic Evaporators and Its Performances of Evaporation and Degradation for Wastewater

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